Increase event listener priority

[Teelevision]

Both the ParamConverterListener (of the Sensio FrameworkExtraBundle; which loads entities via Doctrine) and your ActionEventListener have the priority 0, as far as I can see. To ensure that your listener is called first, set the priority in the service definition to something higher, for example 10.

Otherwise it could happen that the entities for an action are loaded before the transaction begins. Which then makes the action vulnerable to race conditions.